pfadi-bussle/pages/api/auth/[...nextauth].ts

import { NextApiRequest, NextApiResponse } from 'next'
import NextAuth from 'next-auth'
import EmailProvider from 'next-auth/providers/email'

import { MongoDBAdapter } from '@next-auth/mongodb-adapter'
import { MONGO_URI, MONGODB_OPTIONS } from '../../../db'
import { MongoClient } from 'mongodb'

let client: MongoClient

async function getMongoClient() {
  if (!client) {
    client = new MongoClient(MONGO_URI, MONGODB_OPTIONS)
    await client.connect()
  }

  return client
}

export default async function auth(req: NextApiRequest, res: NextApiResponse) {
  return await NextAuth(req, res, {
    secret: process.env.NEXTAUTH_SECRET,
    adapter: MongoDBAdapter(getMongoClient()),
    providers: [
      EmailProvider({
        server: {
          host: 'smtp.sendgrid.net',
          port: 587,
          auth: {
            user: 'apikey',
            pass: process.env.SENDGRID_API_KEY,
          },
        },
        from: process.env.FROM_EMAIL,
      }),
    ],
  })
}